package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisConstants;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {


    @Resource
    private RedisTemplate redisTemplate;

    @Override
    public List<ShopType> queryList() {
        //从缓存中取数据
        List<ShopType> list = redisTemplate.opsForList().range("shop:type", 0, -1);
        if (list.isEmpty()){
            //从数据库中查询并存入缓存中
            List<ShopType> types = this.query().orderByAsc("sort").list();
            redisTemplate.opsForList().leftPushAll("shop:type",types);
            return types;
        }
        return list;

    }
}
